The described error message appears due to a Regression we have introduced with the latest version as a result of fixing another problem. We have logged the issue in our system and is publicly available at: RadGrid HeaderContextMenu out of screen boundary
. Please visit the article, in the bottom you will find a workaround that could server a temporary solution until a fix is delivered. You can also hit the Vote button as well as clicking on Follow to get notified about new changes.
Due to the impact it had on the businesses we have raised its priority to highest and our developer team begun working on it. A fix for it will be planned in the upcoming service pack.
Please excuse us for any inconvenience caused by this issue.
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